Spark-plug.



J. E. SGHAEPER, Jn.

SPARK PLUG.

Arrmcmm Hui) 11212.23. 1999.

Patented Jam 18,1910.

10513123 E. SCEAEFEB, IBM 0F CLEVELAND,

OHIO, ASSIGNOR TO CHARLES W.l FENNER,

or cLEvELnNp, 0310.110114@ Busin-Ess' UNDERJ mani-NAME REFLEX ieNrrroNco.,

F CLEVELAND, 01116.

SPARK-PLUG.

Spcccation of Letters Patent.

Patented Jan. 18, 1910.

Application led February 23, 1909. Serial No.V 479,379.

.i of Cuyahoga and State of Ohio, have invented certain new and usefulImprovements in Spark-Plugs; Vand I hereby eclare the following to.I be'a full,'clear, and exact description of the invention, such as willenable others skilled in the art to which it pertains to make and usethe same.

Thisinvention relates to new and useful im rovements in s ark plugs.

ne object of this invention is to' provide a spark plu having such anarrangement of parts as wi l allow thev gas from the engine cylinderready access to the interior of the casing ofthe plug so 'that it willsurround the ends ofthe electrodes and be readily ignited by the spark.A A further object of my invention is to provide a deflector orbaillearran ed within the plug casing, the action of which will be tostevent the lubricating oil from the cyliner of the en 'ne being forcedback .into the rear part of t e plug casing, where it would -of thesame.

become carbonized on the wall of the casing and form a cross circuitbetween the electrodes of the spark plug.

With these objects in view my invention consists in thecombination ofparts as described in the specification, pointed out in the claims andil ustrated in the accompanyinl drawings. i

n the accompanying drawings Figure 1 is an exterior view of a spark plugembodying my invention. Fig. 2 is a central section Fig. 3 is an endview of the same.

Again referring to the drawings 1 represents the casing or shell of thespark plug which is provided with the usual screw thread 2 whereby itmaybe screwed into the eng-ine cylinder.

ab y provided with flat faces 4 for the application of a wrench inscrewing it into position. In the lower part of the `casing is `ar-vranged a chamber 6 and in the upper part a screw-threaded bore 7. A seat8 is preferably formed in the bore 7 below the screwthreaded portion..In the closed end of the casing 1 is formed a central opening 9 and thesides of said opening are beveled so that the opening at the outside ofthe casing is The vcasing is also preferl smaller than the opening atthe inside and the wall around the opening at the outside of the casingis therefore very thin and may be said to have a knife-edge and formsone of the electrodes. On opposite sides of the opening 9 are formedother openings 10, the object of which will appear later.

Within the casing is arranged a spindle 12 which is preferablyscrew-threaded at its outer end and at its inner end is provided with anenlargement or head 13 which is approximately cone-shaped. In the lowerend of the head portion 13 is inserted a pin 15 of any suitable materialto form the other electrode. On the head portion 13 is arranged abafileor deiector consisting of a funnel or saucer sh. ed flange 16. lThespindle 12 is insulated) from the casingpin any suitable manner and asshown in the drawing this insulation consists of an inner wrappin 18 ofSheet mica and an outer casing o mica rings 19. The insulating niaterialis provided with an annular shoulder 2O which is adapted to t on theseat 8 formed in the. casing. An exterior screwthreaded sleeve 21 isprovided, which screws into the upper end of the casing and clam s theshoulder 20 on the insulation against t e seat 8 thereby holding thesame rigidly within the casing. Washers 23 and 24e are preferablyarranged above and below the shoulder 2O on the insulation. A washer 25is arranged on the s indle above the insulation and on the spindle abovethe washer usual manner.

i When the plug is in use the gas from the c linder will readily' enterthe chamber 6 t rough the openings 10 and the ends of the electrodeswill be entirely surrounded by the gas so that the passage of the sparkbetween the electrodes will readily ignite the same. After a fewexplosions the inner end of the spindle 12 and the Ybaiile 16 thereonwill of course become very hot. After each eXplosion the cylinder oilwill be driven into the rear part thereof where it would becomecarbonized and form a short circuit, but in chamber 6 will strike thebattle 16 which will prevent the 'oil reachin the rear part of thechamber and as the oi strikes the baiile 16 chamber 6 and in ordinaryconstructionsv 'would be deposited upon the walls on the the presentconstructionthe oil entering theare arranged the adjusting nuts 26 inthe 'I a rounded end which is provided with a central opening and smallopenings arranged adjacent to. said central opening, the Wall 'aroundsaid central'opening constituting an electrode and the central openingand openings adjacent the central opening permitting admission andexhaust of gas to and from the casing, a spindle arranged within thecasing and insulated therefrom, anelectrode carried by said spindle, anda saucer-shaped baie on said spindle and turned toward the openings inthe rounded end of the casing, said baffle serving to catch the oildriven into the casing with the gas.

In testimony whereof, I sign the foregoing specificatiomin the presenceof two Witnesses.

A JGSEPH E. SCHAEFER. Jn.

Witnesses:

VICTOR VC., LYNCH, N, MoDoNNELL.

